function query()
{
	var obj = document.getElementById('keyword');
	var keyword = obj.value;
	if (obj.value == "" || obj.value == "标题|作者|关键字|年月(如2014-01)")
		alert("请填写检索关键字");
	else
		window.location = "./blog_list_display.php?search="+keyword;
}
function setfocus()
{
	var obj = document.getElementById('keyword');
	if (obj.value == "标题|作者|关键字|年月(如2014-01)")
		obj.value = "";
}
function killfocus()
{
	var obj = document.getElementById('keyword');
	if (obj.value == "")
		obj.value = "标题|作者|关键字|年月(如2014-01)";
}